Piston ring



Oct. 6, 1925- J. R. DAVIS PISTON RING Filnd Jan. 0, 1922 2 Sheets-Sheet 1 JR.Da1/z '6.

' J. R. DAVIS PISTON RING Oct. 6, 1925- Filed Jan. 20, 1922 2 Sheets-Sheet 2 Patented Oct. 6', 1925;? I

UNITED STATES JOSEPH REX navrsfor ctARxsBURe, wns'r mam 'n'ssrenon 'ro nnx mite rAcrunme. COMPANY, or cmnxsnune, .wnsr vrnemra, A conrona'rrou or WEST VIRGINIA.

PATENT, OEFICE.

rrsron. 3mm;

"a lication filed January 20, mm 10,330,596,

To all whom it may concern:

'Be it known vthat I, J OSEPII Rnx DAvrs, a citizen of the United States, residing at Clarksburg, in the county of Harrison and ,6 State of West Virginia, have invented a new and useful Piston Ring, of which the following'is a specification.

This'invention aims to provide a novel form of spring for a piston ring, the spring .10 being so constructed that it will. act by -com pression to seat the ring, and willact by torsion to expand-the ring.

1 The invention aims, further, to provide a novel form of ring adapted to be used with v aspring of the sort hereinbefore alluded to. It is within the province of the disclosure to improve generally and to enhance the utility of devices of that type to which the invention appertains;

With the above and other objects in view which will appear as the description proceeds, the invention resides in the combinationfand arrangement of parts and in the de- 5 tails of-construction hereinafter described and claimed, it being understood that, within the scope of what is claimed, changes in the precise embodiment of the invention shown can be made without departing from 39 the spirit ofthe invention.

In the accompanying drawings Figure 1 shows in perspective, a ring and a spring constructed in accordance-with the invention: Figure 2 is a transverse section showing the device in place in the cylinder and on the piston of an internal combustion engine; Figure 3 is a section showing the device in place in the piston of an internal combustion engine, the cylinder appearing in section: Figure 4 is a diagrammatic transverse section illustrating one of the operations of the spring; Figure 5 is a diagrammatic section of the ring and the spring; Figure 5 being supplementalto Figure 4; Figure 6 is a diagrammatic transverse section illustrating another operation of the spring; and Figure 7 is a section supplemental to Figure 6 and illustrating, further, the operation contemplated in Figure 6.

The numeral 1 marks the cylinder of an internal combustion engine, wherein a piston 2 is mounted for reciprocation, the piston having a Circumferential groove 3 defined by an inner. wall 4"and transverse wa-llsb and 6',

An expansible. ring 7 is seated in the groove 3, the ends of the ring 7 being halved together as at 11, or 'beingotherwise constructed inv accordance withaccepted prin vacute angle to the axis of the spring. The

loops 24 are received in the angle defined by the surfaces 9 and 10 of the groove 8 in. the ring 7, the loops 14 being disposed in the angle defined by the walls 5 and4' of the groove 3 in the piston 2. The ends of the spring 12 preferably are flexed inwardly, as shown at 15, so that they may ride, without catching, in the angle formed by the walls 9 and 10 of the groove 8 in the ring 7. When the ring 7 is not in place, as shown in Figure 1, the loops 14"project,

as-at 16, beyond one transverse surface 17 of the ring 7. a

Noting that thejloops 14 of the spring 12 project as at 16 beyond one transverse surface 17 of the ring 7, before the ring is placed in the groove 3 of the piston 2, it will be obvious that, when the spring is in place, as in Figure 4, the loops 14 andR24 of the spring will be compressed, and will react, in the direction of the arrows A. to force the ring in the direction of the arrow B, against the surface 6 of the groove 3' in the piston. 2, thereby affording an 'oil tight joint. 1

Passing to Figure 6, it will be seen that when the spring 12 is in place, the loops 24 will have been swung inwardly, from the dotted line position of Figure 6 to the solid line position thereof, the spring exerting a torque, as indicated by the arrow C, and the loops 24 tending to swing outwardly. As a consequence, the ring will be expanded, in the direction of the arrowlD, and will be caused to'bea'r against the inner surface of the cylinder 1.

Generally stated, the spring 12 is so constructed that it acts by compression to seat thewring, and acts by torsion to expand the of opposite loops respectively bearing in rilzg. the acute angle of the rdinarily, the ring 7 is placed in the of the channel in the piston. v groove 3 of the piston 2, and, then, the 2. Ina piston ring structure, the' comspring 12 is inserted endwise into the groove bination with the piston having an annular 8 of the ring 7, between the ends 11 of the channel for confining the .ring, of a ring ring, and, since theextreinities of: the spring body having a groove on its inner face pre- 12 are-fle'xedas shown at 15, the spring will senting an acute angle, and a spring con-r 35 respect to the ends 11 of the 'ring' 7.

- slide, readily, lon tudinally into lace, it sisting of'a body of spring wire .havlng opispose the extremities 15 posite extended loops which aredisposed at spring in any desired position with an acute angle to the axis of the spring, said spring being confined between the angle As will be evident when Figures 4 and 6 of the groove and the angle of the'channel. are examined, it will be seenthat the loops 3. In a piston ring structure, the com- 24 and 14 of the spring 12 define the sur bination with the piston having an annular face of a cone, and the shape of the spring channel for confining the ring, of a; ring may be-described briefly by alluding to the body having a groove on its inner face preaforesaid peculiarity in the construction of sentingan acute angle, and a spring conthe spring. sisting of a body of spring wire for parts What is claimed is v v which act compress'ively' and parts which 1. In a piston ring structure, the com operate by torsion said arts respectively bination with the piston having an annular engaging with an angle 0? the channel and channel for confining the ring, of a ring the angle of the groove in the 'rin body having a groove its inner face pre- In testimony that I claim the oregoing senting' an acute an e, and aspring conas my own, I sisting of abody 0 spring wire provided nature. with oppositely extended loops, the crowns bein possible to of the JOSEILIH n'Ex avis.

oove and the angle have hereto affixed my' af' 

